Various.

These papers were collected by J S Bumpus, antiquarian researcher, from a number of sources including the personal papers of Maria Hackett of 8 Crosby Square, Bishopsgate (1783-1874). Maria Hackett devoted much of her life to campaigning for various causes, notably the welfare and education of the choristers at St Paul's Cathedral and the preservation of Crosby Hall, Bishopsgate. Her interests and activities are described in "Miss Hackett of Crosby Square", by K I Garrett, in Guildhall Studies in London History, vol.1, no.3, (1974), pp.150-62.

Most of the letters were formerly in the possession of William Hawes, vicar choral, almoner and master of the choristers at St Paul's Cathedral, 1812-46, to whom some of the letters are addressed. The writers include Sir Andrew Barnard, Alfred Bunn, Lord Burghersh (John Fane), Joseph Grimaldi, Samuel Carter Hall, Rev Sydney Smith and many prominent organists and musicians of the late 18th and 19th centuries, including Adrien Boildieu, John Braham, G A P Bridgetower, Thomas Cooke, John Goss, William Jackson, Vincent Novello, Mary Paton, William Shield and Charles and Samuel Sebastian Wesley.